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Current Assets - Receivables - Summary of Current Assets - Receivables (Parenthetical) (Details) - USD ($)	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Current Assets Receivables [Abstract]
Receivables with material expected credit loss	$ 0	$ 0	$ 0

X

- Definition

Current assets - receivables abstract.

+ References

No definition available.

+ Details

Name:	opt_CurrentAssetsReceivablesAbstract
Namespace Prefix:	opt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Receivables with material expected credit loss.

+ References

No definition available.

+ Details

Name:	opt_ReceivablesWithMaterialExpectedCreditLoss
Namespace Prefix:	opt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant